PE wrapping film tension adjusting device based on pneumatic actuator

Abstract

The present application belongs to the technical field of PE wrapping film conveying, and particularly relates to a PE wrapping film tension adjusting device based on a pneumatic actuator, which comprises a tensioner, wherein the tensioner comprises a base, two supporting plates, two sliding blocks, a tension wheel and an adjusting mechanism; the adjusting mechanism comprises a chamber, a gas pressure plate and a top rod, the two supporting plates are respectively fixedly installed on the left and right sides above the base, and the inner walls are both provided with sliding grooves, the two sliding blocks are respectively slidably connected in the two sliding grooves, the tension wheel is rotatably connected between the two sliding blocks, the chamber is fixedly installed at the bottom of one of the sliding grooves and is hollow inside, the gas pressure plate is slidably connected to the inner wall of the chamber, and a sliding hole is arranged above the chamber. The device solves the problem that the current PE wrapping film conveying cannot control the tension and force in high precision, resulting in looseness of the PE wrapping film after winding or damage of the PE wrapping film.

Description

Technical Field

[0001] This invention belongs to the technical field of PE wrapping film conveying, and specifically relates to a PE wrapping film tension adjustment device based on a pneumatic actuator. Background Technology

[0002] In the plastic packaging and logistics transportation sectors, PE stretch film is widely used due to its excellent tensile properties and fastening strength. During the production or automated packaging process of stretch film, the stability of tension control directly affects the forming quality of the film and the packaging effect. However, existing tension adjustment devices often suffer from slow response speed, low adjustment accuracy, and difficulty in handling dynamic winding fluctuations when dealing with highly elastic and ductile materials like PE stretch film.

[0003] A search revealed a patent for an automatically adjustable tension storage tensioner, publication number CN107010453A, dated August 4, 2017. This patent uses a cylinder to adjust tension and combines a pressure sensor and controller for automatic control. However, this technical solution primarily targets a storage-type structure, which contains complex mechanical transmission components such as synchronous sprockets, chains, and moving roller seats. The mechanical friction and transmission gaps present in these components during operation can easily limit the sensitivity of tension adjustment. Furthermore, when handling PE wrapping film with high elongation properties, the storage-type buffering method struggles to achieve microsecond-level tension fine-tuning, easily leading to uneven stress or localized overstretching of the film material.

[0004] A search revealed a fabric tension adjustment device with publication number CN116081374A, published on May 9, 2023. This patent guides the tension roller to move up and down using a linear displacement mechanism, utilizes a cylinder drive to adjust the fabric tension, and includes an automatic force direction correction mechanism. However, this technical solution is mainly designed for low elongation materials such as fabrics. The physical properties of PE wrapping film and fabric differ significantly, and the tension fluctuations of the PE film during winding due to diameter changes exhibit nonlinear characteristics.

[0005] The aforementioned problems indicate that existing tension adjustment devices still have certain shortcomings in terms of the sensitivity of mechanical transmission, the real-time nature of dynamic response, and adaptability to the special physical properties of PE stretch film. Therefore, this invention provides a PE stretch film tension adjustment device based on a pneumatic actuator, aiming to utilize the high-speed response characteristics of the pneumatic actuator combined with an optimized mechanical structure to improve the accuracy and response speed of tension adjustment, thereby meeting the needs of the modern packaging industry for efficient and precise tension control. Summary of the Invention

[0006] The purpose of this invention is to provide a PE winding film tension adjustment device based on a pneumatic actuator to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a PE wrapping film tension adjustment device based on a pneumatic actuator, comprising a tension machine, the tension machine comprising a base, two support plates, two sliders, a tension wheel, and an adjustment mechanism; the adjustment mechanism comprises a chamber, a pressure plate, and a top rod, the two support plates being fixedly installed on the left and right sides above the base respectively, and each having a groove on its inner wall, the two sliders being slidably connected in the two grooves respectively, the tension wheel being rotatably connected between the two sliders, the chamber being fixedly installed at the bottom of one of the grooves, and having a hollow interior, the pressure plate being slidably connected to the inner wall of the chamber, a sliding hole being provided above the chamber, and the top rod being slidably connected in the sliding hole, the lower end of the top rod being connected to the pressure plate, and the upper end contacting the bottom of one of the sliders, the bottom of the chamber being connected to a pneumatic actuator pipe; the bottom surface of the PE wrapping film and the outer surface of the tension wheel are in contact with each other.

[0008] The present invention further illustrates that a slide rod is integrally formed in the middle of the inner wall of one of the slide grooves, and one of the sliders is slidably connected to the slide rod.

[0009] The present invention further illustrates that a buffer rod is integrally formed in the middle of the top rod, and the buffer rod is located inside the chamber; two spring pieces are provided above the inner wall of the chamber, and the two spring pieces are respectively located on both sides of the top rod; the two ends of the buffer rod are respectively embedded in the two spring pieces; the upper end and the outer end of the spring pieces are in contact with the inner wall of the chamber.

[0010] The present invention further illustrates that the middle of the spring sheet is inverted V-shaped, that is, the middle of the spring sheet is inclined, and the outer end of the buffer rod is located in the middle of the spring sheet.

[0011] The present invention further illustrates that a sleeve is integrally formed on the upper part of the chamber, and a push rod is slidably connected to the sleeve. A spiral groove is provided on the inner wall of the sleeve, and a ball is slidably connected to the outer side of the push rod, with the ball embedded in the spiral groove.

[0012] The present invention further illustrates that the upper surface of the air pressure plate is provided with a rotating hole, and the lower part of the push rod is rotatably connected to the air pressure plate through the rotating hole; both sides of the inner wall of the chamber are integrally formed with arc-shaped blocks, and after the push rod rotates, the buffer rod and the arc-shaped blocks come into contact with each other.

[0013] The present invention further illustrates that the bottom of the inner wall of the rotating hole is provided with several grooves, and the lower end of the top rod is provided with several bosses, and the bosses are embedded in the grooves.

[0014] The present invention further illustrates that a sealing ring is provided on the outer side of the air pressure plate, and is slidably connected to the inner wall of the chamber through the sealing ring.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are: 1. During the PE stretch film conveying process, the top rod pushes the slider upward, and the two sliders drive the tension wheel to move upward synchronously, thereby increasing the tension on the PE stretch film, thus improving the tightness of the winding, greatly improving the winding quality, and preventing the PE stretch film from loosening and falling off during subsequent transportation or handling; 2. The spring sheet allows the buffer rod to apply a reaction force to the top rod, so as to avoid the pneumatic actuator from having too high a gas delivery intensity, which would cause the tension wheel to rise rapidly and thus quickly lift the PE wrapping film, increasing the tension rapidly. This prevents the PE wrapping film from being damaged or broken by a sudden strong impact, thereby improving the delivery quality of the PE wrapping film. 3. Through the cooperation of the spiral groove and the ball bearing, an upward axial force is generated during the rolling process, causing the spring to rotate to the outer end and contact the arc block. The arc block squeezes the spring inward and deforms it, which further enhances the force exerted on the buffer rod and greatly improves the buffer strength. This can quickly stop the rapid upward movement of the top rod, so as to fully avoid the rapid upward squeezing of the PE wrapping film caused by excessive air pressure, thus protecting the PE wrapping film to the greatest extent. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram of the internal structure of the cavity of the present invention; Figure 4 This is an exploded view of the internal structure of the cavity of the present invention; Figure 5 This is a top view of the chamber of the present invention; Figure 6 This is a plan view of the chamber of the present invention; In the diagram: 1. Base; 2. Support plate; 3. Slider; 4. Tension wheel; 5. Chamber; 51. Air pressure plate; 511. Groove; 52. Top rod; 521. Ball bearing; 522. Boss; 53. Buffer rod; 54. Spring; 55. Sleeve; 551. Spiral groove; 56. Arc block; 6. Slide rod; 7. Sealing ring. Detailed Implementation

[0017] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Please see Figures 1-6 The present invention provides a technical solution: a PE wrapping film tension adjustment device based on a pneumatic actuator, including a tension machine, which includes a base 1, two support plates 2, two sliders 3, a tension wheel 4, and an adjustment mechanism; The adjustment mechanism includes a chamber 5, a pneumatic plate 51, and a push rod 52. Two support plates 2 are fixedly installed on the left and right sides above the base 1, and each has a groove on its inner wall. Two sliders 3 are slidably connected in the two grooves. A tension wheel 4 is rotatably connected between the two sliders 3. The chamber 5 is fixedly installed at the bottom of one of the grooves and is hollow inside. The pneumatic plate 51 is slidably connected to the inner wall of the chamber 5. A sliding hole is provided above the chamber 5, and the push rod 52 is slidably connected in the sliding hole. The lower end of the push rod 52 is connected to the pneumatic plate 51, and the upper end is in contact with the bottom of one of the sliders 3. The bottom of the chamber 5 is connected to the pneumatic actuator pipe. The bottom surface of the PE stretch film is in contact with the outer surface of the tension wheel 4; During the PE stretch film conveying process, it is adhered to the tension wheel 4 and wound around it. Before winding, in order to improve the tightness of the winding and improve the winding quality, the operator can drive the pneumatic actuator to inject gas into the chamber 5. The air pressure pushes the air pressure plate 51 to slide upward along the inner wall of the chamber 5, thereby pushing the slider 3 upward through the top rod 52. The two sliders 3 drive the tension wheel 4 to move upward synchronously, thereby increasing the tension on the PE stretch film, thus improving the tightness of the winding, greatly improving the winding quality, and preventing the PE stretch film from loosening and falling off during subsequent transportation or handling.

[0019] One of the grooves has a slide rod 6 integrally formed in the middle of its inner wall, and one of the sliders 3 is slidably connected to the slide rod 6; One of the sliders 3 is pushed upward by the top rod 52 and moves upward through the tension wheel 4, causing the other slider 3 to move upward, so that it slides upward through the slide rod 6 and the inner wall of the groove. This improves the stability of the tension wheel 4 when it moves upward, so as to avoid the tension wheel 4 tilting itself when applying tension, which would result in uneven tension application and affect the winding operation of PE wrapping film.

[0020] A buffer rod 53 is integrally formed in the middle of the push rod 52, and the buffer rod 53 is located inside the chamber 5; Two spring pieces 54 are provided on the upper part of the inner wall of the chamber 5, and the two spring pieces 54 are located on both sides of the top rod 52 respectively. The two ends of the buffer rod 53 are embedded in the two spring pieces 54 respectively. The upper end and the outer end of the spring piece 54 are in contact with the inner wall of the chamber 5. When the push rod 52 moves upward, it drives the buffer rod 53 to move upward until the buffer rod 53 contacts the spring 54 and squeezes the spring 54. After the spring 54 is subjected to force, it generates a reaction force, which applies a reaction force to the push rod 52 through the buffer rod 53. This is to avoid the pneumatic actuator's gas delivery intensity being too high, which would cause the tension wheel 4 to rise rapidly, thereby quickly lifting the PE wrapping film and increasing the tension rapidly. This prevents the PE wrapping film from being suddenly subjected to a strong impact, which could cause damage or breakage, and improves the delivery quality of the PE wrapping film.

[0021] The middle of the spring piece 54 is inverted V-shaped, that is, the middle of the spring piece 54 is inclined, and the outer end of the buffer rod 53 is located in the middle of the spring piece 54; Because the spring sheet 54 is inverted V-shaped, when the buffer rod 53 squeezes the spring sheet 54, the spring sheet 54 deforms. As the squeezing continues, the inclined part of the buffer rod 53 in the middle of the spring sheet 54 rises continuously. The reaction force exerted by the spring sheet 54 on the buffer rod 53 through its inclined part gradually increases, and the buffering strength gradually increases, so as to further improve the buffering effect. This greatly improves the control accuracy of tension and makes the tension application more stable.

[0022] A sleeve 55 is integrally formed on the upper part of the chamber 5, and a push rod 52 is slidably connected to the sleeve 55. A spiral groove 551 is provided on the inner wall of the sleeve 55, and a ball bearing 521 is slidably connected to the outer side of the push rod 52, and the ball bearing 521 is embedded in the spiral groove 551.

[0023] The upper surface of the pneumatic plate 51 is provided with a rotating hole, and the lower part of the push rod 52 is rotatably connected to the pneumatic plate 51 through the rotating hole; Both sides of the inner wall of chamber 5 are integrally formed with arc-shaped blocks 56. After the push rod 52 rotates, the buffer rod 53 and the arc-shaped blocks 56 come into contact with each other. As the push rod 52 gradually rises, it drives its spiral groove 551 to move upward, causing the ball bearing 521 to roll within the spiral groove 551. During the rolling process, an upward axial force is generated, which drives the push rod 52 to rotate. The rotation of the push rod 52 drives the buffer rod 53 to rotate around its center, and drives the spring piece 54 to rotate. When the spring piece 54 rotates to the outer end, it contacts the arc-shaped block 56 and is squeezed by the arc-shaped block 56, which squeezes the spring piece 54 inward and deforms it. The force exerted on the buffer rod 53 is further enhanced, and the buffer strength is greatly improved. This can quickly stop the rapid upward movement of the push rod 52, so as to fully avoid the rapid upward squeezing of the PE wrapping film caused by excessive air pressure, thereby protecting the PE wrapping film to the greatest extent.

[0024] The bottom of the inner wall of the rotating hole is provided with several grooves 511, and the lower end of the push rod 52 is provided with several protrusions 522, and the protrusions 522 are embedded in the grooves 511. As the top rod 52 moves upward, the tension wheel 4 continuously squeezes the PE stretch film, applying tension. At the same time, the top rod 52 rotates, causing the boss 522 at its bottom to rotate around its center. This causes the boss 522 to disengage from the groove 511 and then re-enter the groove 511, resulting in the top rod 52 continuously vibrating up and down in small amplitudes. This not only increases the tension but also prevents excessive tension from damaging the PE stretch film. The tension application process is more stable, the tension control accuracy is higher, and the PE stretch film is further protected.

[0025] A sealing ring 7 is provided on the outer side of the air pressure plate 51, and is slidably connected to the inner wall of the chamber 5 through the sealing ring 7; By setting the sealing ring 7 to provide a seal, the air pressure plate 51 is more stable when it is moved by air pressure. The device has a simple overall structure and low manufacturing cost.

[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A PE wrapping film tension regulating device based on a pneumatic actuator, comprising a tensioner, characterized in that: The tension machine includes a base (1), two support plates (2), two sliders (3), a tension wheel (4), and an adjustment mechanism; The adjustment mechanism includes a chamber (5), a pneumatic plate (51), and a top rod (52). The two support plates (2) are fixedly installed on the left and right sides above the base (1), and the inner walls are provided with sliding grooves. The two sliders (3) are slidably connected in the two sliding grooves. The tension wheel (4) is rotatably connected between the two sliders (3). The chamber (5) is fixedly installed at the bottom of one of the sliding grooves and is hollow inside. The pneumatic plate (51) is slidably connected to the inner wall of the chamber (5). A sliding hole is provided above the chamber (5), and the top rod (52) is slidably connected in the sliding hole. The lower end of the top rod (52) is connected to the pneumatic plate (51), and the upper end is in contact with the bottom of one of the sliders (3). The bottom of the chamber (5) is connected to the pneumatic actuator pipe. The bottom surface of the PE wrapping film is in contact with the outer surface of the tension wheel (4).

2. The PE wrapping film tension regulating device based on pneumatic actuator according to claim 1, characterized in that: One of the grooves has a slide rod (6) integrally formed in the middle of its inner wall, and one of the sliders (3) is slidably connected to the slide rod (6).

3. The PE wrapping film tension regulating device based on pneumatic actuator according to claim 2, characterized in that: The top rod (52) has a buffer rod (53) integrally formed in the middle, and the buffer rod (53) is located inside the chamber (5); Two spring pieces (54) are provided on the upper part of the inner wall of the chamber (5), and the two spring pieces (54) are located on both sides of the top rod (52). The two ends of the buffer rod (53) are embedded in the two spring pieces (54), and the upper end and the outer end of the spring piece (54) are in contact with the inner wall of the chamber (5).

4. The PE wrapping film tension regulating device based on pneumatic actuator according to claim 3, characterized in that: The middle of the spring piece (54) is inverted V-shaped, that is, the middle of the spring piece (54) is inclined, and the outer end of the buffer rod (53) is located in the middle of the spring piece (54).

5. The PE wrapping film tension regulating device based on pneumatic actuator according to claim 4, characterized in that: A sleeve (55) is integrally formed on the upper part of the chamber (5), and a push rod (52) is slidably connected to the sleeve (55). A spiral groove (551) is provided on the inner wall of the sleeve (55), and a ball (521) is slidably connected to the outer side of the push rod (52), and the ball (521) is embedded in the spiral groove (551).

6. The PE wrapping film tension regulating device based on pneumatic actuator according to claim 5, characterized in that: The upper surface of the pneumatic plate (51) is provided with a rotating hole, and the bottom of the top rod (52) is rotatably connected to the pneumatic plate (51) through the rotating hole; The inner wall of the chamber (5) is integrally formed with arc-shaped blocks (56) on both sides. After the top rod (52) rotates, the buffer rod (53) and the arc-shaped blocks (56) come into contact with each other.

7. A PE wrapping film tension regulating device based on a pneumatic actuator according to claim 6, characterized in that: The bottom of the inner wall of the rotating hole is provided with several grooves (511), and the lower end of the top rod (52) is provided with several bosses (522), and the bosses (522) are embedded in the grooves (511).

8. The PE wrapping film tension regulating device based on pneumatic actuator according to claim 7, characterized in that: The outer side of the air pressure plate (51) is provided with a sealing ring (7), and is slidably connected to the inner wall of the chamber (5) through the sealing ring (7).

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